Azo dyestuffs



Patented May 15, 1934 UNITED STATES PATENT OFF 1,958,758 ICE 1,958,758 AZO DYESTUFFS Hans Krzikalla, Ludwigshafen- Alfred Kirsch, Mannheim,

to General Aniline N. Y.,

Works, Inc.,

a corporation of Delaware No Drawing. Application February 13, 1933,

Serial N 656,584. I 1932 6 Claims.

respond to the general formula:

to orange shades.

The following examples will further illustrate the nature of this invention but the invention is not restricted to these examples. The parts are by weight.

Example 1 22.6 parts of the condensation product from 1 molecular proportion of 11 Germany February 23,

Example 2 28.6 parts of the condensation om 1 molecular proportion of 1. A20 dyestufls corresponding to the general formula R X-N=NY l\ l R2 X-N=N-Y2 ally being soluble in organic solvents.

2. A20 dyestuffs corresponding to the general formula R1 X-N=N-Yl R2 X-N=NY2, herein R1 and R2 stand for two equal alkyl radiw cles, X for an aromatic radicle of the benzene Y1 and Y2 for a benzene radicle containing at least one hydroxy group, the said dyestuffs being free from sulpho and carboxyl groups,

5. The reddish yellow azo dyestuff corresponding to the formula yielding from yellow to orange dyeings and usu- 0cm CH3 ally being soluble in organic solvents.

3. A20 dyestufis corresponding to the general O formula CH3 wherein X stands for an aromatic radicle oi" the OH H 3 3 and Y1 and Y2 for a benzene radiat least one hydroxy group, the said dyestuff having an excellent fastness to free from sulpho and carll benzene series cle containing said dyestuffs being boxyl groups, yielding from yellow to orange dyee. The yel ow a dy pondi to the ings and usually being soluble in organic solvents. formula 4. The yellow azo dyestufi corresponding to CH3 CH3 the formula CH3 O 'Q 9/ OH OH CH OH 0 1 0H3 C -C2 H3 is said dyestufi having an excellent fastness to CH3 light. I said dyestuff having an excellent fastness to HANS KRZIKALLA. "light. ALFRED KIRSCH. 

